<VV> Spark Plugs...

[James Davis]

Close.  The 44FFS are extended reach.  The plugs have a barrel length 
0.25 longer than the 44FF; that extension is unthreaded but a reduced 
diameter so carboning does not interfere with removal.  The porcelain 
electrode insulator is also expended out of the barrel.  The idea is 
to run the plug tip hotter an prevent fowling and improve cold 
weather start and warm-up. Since the ground electrode runs at the 
same temp as the 44FF, there is no more chance of preignition than 
with the 44FF.  Piston crown clearance can be a problem with pop-up 
pistons (as in the A.I.R. 110 engines).  I will send you pictures if you wish.
Jim Davis





At 01:01 AM 1/19/2006, J R Read_HML wrote:
>The difference between 44FF and 44FFS (if I recall correctly) is the 
>length of the threads on the base of the plugs.  I forget which is 
>longer - but I'll check my stock.  I think that I have some of 
>each.  I can tell you that the longer one is the more desirable and 
>I think (but will have to check) that the S is the longer one.  I 
>think it stands for extended reach.  It has been a long time since 
>I've had to replace any plugs, so I just don't remember at the moment.
>
>Attachments (if any) are scanned with anti-virus software.
>
>Later, JR